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Flying Saucer

Post  Vachtra on Mon Jul 16, 2018 10:27 am

It's been nearly 30 years since I've flown anything but I found this little thing at a comic book store in Houston.


Picked it up for just under $50. Seems like it's never been flown. The stickers are still on the sheets. Really not sure what it is that I got but everything I look at points to a 21924 .049 cox engine. The box itself says .045 cox but not sure what the 21924 is. Still need to find the starter kit that it recommends (that is to say starter clip, fuel, wrenches, oil) and I guess whatever else I'll need.

One big worry is how long this thing will fly around and how high it'll go. Should I tether it down somehow so it doesn't interfere with air traffic?

A little clueless here since I've only done line control planes before.

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Re: Flying Saucer

Post  Kim on Mon Jul 16, 2018 12:53 pm

I think Kevin was getting a good 200+ feet with his at this past year's S.M.A.L.L. Fly-In.

You DO need a big field and calm air !!!

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Re: Flying Saucer

Post  Kim on Mon Jul 16, 2018 1:36 pm

The starter kit no longer exists, but you can get you accessories from these guys

http://www.exmodelengines.com/home.php?cat=264

https://coxengines.ca/

and I think Fitz still has some fuel:

http://fitzfuels.com/index.php
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Re: Flying Saucer

Post  Vachtra on Mon Jul 16, 2018 3:41 pm

Seems that Fitz is out of fuel.  Found a local shop though that sells the fuel and supplies I'll need.
Thanks for the advice and information on performance though. I'll start with a very little amount of fuel so it doesn't get away from me too far.
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Re: Flying Saucer

Post  Oldenginerod on Mon Jul 16, 2018 5:19 pm

Vachtra wrote:Seems that Fitz is out of fuel.  Found a local shop though that sells the fuel and supplies I'll need.
Thanks for the advice and information on performance though. I'll start with a very little amount of fuel so it doesn't get away from me too far.

Just make sure you get the correct fuel to suit the Cox engine. It needs to be "1/2A" fuel of around 25% nitro with castor oil up to around 10%, plus another 10% synthetic oil. Most regular RC fuels sold for modern engines probably won't be suitable.
Seems to be a nitro shortage currently, so finding the right fuel may be difficult.
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Re: Flying Saucer

Post  getback on Tue Jul 17, 2018 4:03 pm

Yea on the purchase ! i hope you can get a video of that baby fling would love to see it and you in Action. Very Happy
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Re: Flying Saucer

Post  ticomareado on Wed Jul 18, 2018 11:13 am

What does it do when engine quits at 200 ft. AGL?
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Re: Flying Saucer

Post  944_Jim on Wed Jul 18, 2018 11:46 am

I had one back in the day. When the engine stops, it falls. Mine never broke. But eventually I robbed it of the engine for more entertaining aircraft ( read that- Got bored!).
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Re: Flying Saucer

Post  Vachtra on Wed Jul 18, 2018 4:05 pm

My plan is to run it the first time with just a little gas to see how it lifts off. Then I'm thinking about adding weights to keep it from getting too high, more of a floating to it. If I add the weights to the inside of the saucer just under the blade in the thick part it should both be low enough to keep it level and not hinder the look of it in flight. I'm thinking of a game of hot potato with a flying saucer in a field.
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Re: Flying Saucer

Post  944_Jim on Wed Jul 18, 2018 4:59 pm

Flip the prop to minimize thrust. I wouldn't add weights.
JMHO.
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Re: Flying Saucer

Post  roddie on Wed Jul 18, 2018 6:55 pm

944_Jim wrote:Flip the prop to minimize thrust. I wouldn't add weights.
JMHO.

I think that's good advice. This model was designed to use a specified propeller. Hopefully that spec./propeller is mounted on its engine. I don't know what that specified propeller should be.. but looking at various web-photos; it looks (to me..) like a 6 inch diameter propeller. If so; it would likely be a standard/tractor propeller. Cox made 6 inch diameter propellers in various pitches. I would "guess" this propeller to be a 6 inch diameter by 3 inch pitch (6"d x 3"p). This is just a guess though.

You can source other aero-propellers to do the job.. but it would be pertinent to know the original Cox specs.
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Re: Flying Saucer

Post  Vachtra on Thu Jul 19, 2018 10:06 am

The prop is attached and flipping it might be a good start once I get into it but that will only get me to a different thrust. To "fine tune" it, so that is more or less hovers, I think weights will be necessary. Hopefully less so with the inverted prop though. Thanks for the good advice.

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Re: Flying Saucer

Post  944_Jim on Thu Jul 19, 2018 8:54 pm

Just my humble opinion, and certainly not wanting to be a wet blanket, but...

The problem with hovering is that you can't adjust thrust automatically. Drones use gyros to maintain a particular attitude/vector and still hunt even in mild wind.

I used to adjust fuel flow for effect, but still all I could manage was either going up barely (and most erratically), or really go up when leaned out. I could never get it to maintain a particular altitude, such that tossing it like a frisbee hoping for horizontal flight.

As the engine spins one way, the body will spin the other way. There is no "anti-torque" to this thing. And as the body spins, so does the fuel in the little pancake tank. So much that even that can affect flight.

I recommend (based on 40 year old memories) that you find a wide-open space, short-tank the toy, and watch it behave as intended...at least a few times. Even in it's intended manner, this thing can be entertaining...just like flying rags.
Then progress to playing with weights and such.

I would never recommend tossing it "hot-potato" or frisbee to even the most brave of your buddies to catch it. Not without finger screens top and bottom.

That's why the engine got salvaged for control line later on.

Play on, Brother! Post videos.
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Re: Flying Saucer

Post  Vachtra on Mon Jul 23, 2018 8:50 am

It's funny that you talk about anti torque. Those fins just under the prop are actually meant to do the opposite. They spin the saucer in the direction of the torque making the saucer spin the opposite direction of the prop. That in itself actually reduces the lift slightly but makes it spin even more than if it was only from the torque.
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Re: Flying Saucer

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